Quantitative evaluation of the mass-flow effect of seawater with inhomogeneous density upon the vertical cylinders (supports of submersible and semi submersible drilling platforms) has been performed considering water flows, induced superficial and internal waves. Calculated results are compared with experimental data obtained previously in the basin with stratiphied water. The modal structure and amplitude-phase parameters of internal waves generated by a vertical cylinder crossing the free surface and the surface pycnocline are studied as functions of the cylinder velocity and submergence depth relative to a density jump.
The project is dedicated to developing recommendations for the production of a complex potassium, calcium and phosphorus fertilizer with a prolonged effect from mining waste from the Kovdors-mica and Kovdorskiy GOK mines. An important task is to dispose of the dumps accumulated over the years of operation of these actively operating mines. The relevance of creating a new complex potash fertilizer from phlogopite, apatite and calcite is determined by the fact that it will have a prolonged action without high solubility. In order to experimentally test the possibility of using these mineral wastes as fertilizer in summer 2001 we carried out a series of micro-daily field experiments with potato varieties Nevskiy, which are typical “potassium” plants. As a result, we found that not only phlogopite and calcite, but also the finely ground Francolite, which is a natural source of phosphorus, affect the plants. The experiment was accompanied by monitoring of the balance of the main chemical elements in the fertilizer-soil-plant chain. This is the next step towards the development of a new type of complex fertilizer of prolonged action, containing the necessary elements (K, Ca, Mg and P) in a form accessible to plants and not easily washed out of the soil by surface water.
